标题：Thermopower of an Oxide-Alloy Composite System Obtained by In Situ Carbothermal Synthesis
作者：WENBIN SU;CHUNLEI WANG;HONGCHAO WANG;JIAN LIU;PENG ZHENG;JIALIANG ZHANG
作者机构：[Su, W] School of Physics, Shandong University, Jinan, Shandong 250100, China;[ Wang, C] School of Physics, Shandong University, Jinan, Shandong 25010 更多
会议名称：29th International Conference on Thermoelectrics (ICT)
会议日期：MAY 30-JUN 03, 2010
来源：Journal of Electronic Materials
关键词：Thermoelectric properties;Seebeck coefficient;alloy-oxide composite
摘要：A new multiphase thermoelectric material, composed of La(Fe_(0.6)Co_(0.4))O_(3) oxide and FeCo alloy, has been synthesized by in situ carbothermal synthesis. Polycrystalline samples were prepared by the standard solid-state reaction method using starting materials of La(Fe_(0.6)Co_(0.4))O_(3), Co_(3)O_(4), Fe_(3)O_(4), and carbon. The structure study showed that the resultant sample was a composite system of an oxide and alloy. It was found that the FeCo alloy in the samples was synthesized by the carbothermal reduction method from the starting oxide materials of Co_(3)O_(4) and Fe_(3)O_(4). The composite system exhibited metallic behavior in the temperature dependences of the electrical resistivity and the negative Seebeck coefficient. The Seebeck coefficient values of this composite system were about four times larger than those of the FeCo alloys alone, and the electrical resistivity remained as low as that of the FeCo alloys alone. As a result, the power factor of this composite system was evidently improved compared with both the La(Fe_(0.6)Co_(0.4))O_(3) oxide and the FeCo alloys.